Telephone substation apparatus



July 16, 1935. RLLUM 2,008,287

TELEPHONE SUBSTATION APPARATUS Filed Oct. 20, 1932 4 Sheets-Sheet 1 INVENTOR 6. R. L UM EV ATTORNEY:

July 16, 1935.

G. R. LUM

TELEPHONE SUBSTATION APPARATUS Filed Oct. 20, 1932 4 Sheets-h-Sheet 2 ATTORNAEY July 16, 1935. G. R. LUM 2,008,287

I TELEPHONE SUBSTATION APPARATUS Filed Oct 20, 1932 4 Sheets-Sheet 5 IN W. N TOR GRLUM BY Mm 7% A T TORNE Y July 16, 1935. G. R. LUM 2,008,287

7 TELEPHONE SUBSTATION APPARATUS Filed Oct 20, 1952 4 Sheets-Sheet 4 INVENTOP 6. PLUM BY 7 Ouau& 1M

ATTORNEY Patented July 16, 1935 TELEPHONE SUBSTATION APPARATUS George R. Lum, New York, N. Y., assignor to Bell" Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application October 20, 1932, Serial No. 638,679

3 Claims.

This invention relates to telephone substation apparatus and more particularly to desk stands for hand telephones.

One object of this invention is to prevent accidental actuation of the line contacts in desk stands for hand telephones.

Another object of this invention is to simplify the structure, to expedite the manufacture, and to reduce the manufacturing cost of telephone substation apparatus.

In one embodiment illustrative of this invention, a desk stand for hand telephones comprises a casing having a base portion and a pedestal portion, and a plurality of pairs of tines extending from the pedestal portion and forming a cradle for accommodating the handle of the hand telephone. A plurality of plungers are disposed one between each pair of tines and extend into the casing to actuate line contacts when the hand telephone is placed upon or removed from the cradle. A metallic support or stamping is moun ed within the casing and includes a pair of spaced parallel arms, and a third arm upon which the line contacts are mounted. 'A bracket member is rockably mounted between the parallel arms of the stamping and is provided with a pluralty of extensions each of which is connected to a corresponding one of the plungers. The bracket member is also provided with an extension engaging the line contact assembly.

A base plate is hinged to the base of the casingand has mounted thereon a supporting plate upon which various elements of substation apparatus,

such as a ringer, condenser and induction coil of a telephone subset are mounted. The supporting plate is secured to the base plate by a single screw.

The invention and the features will be understood more fully and clearly from the following detailed description with reference to the accompanying drawings in which:

Fig. 1 is a perspective view of a telephone desk set including a desk stand constructed in accordance with this invention;

Fig. 2 is a side elevational view in cross-section of the desk stand shown in Fig. 1;

Fig. 3 is a front elevational view in crosssection of the desk stand shown in Fig. 1;

Fig. 4 is an exploded View showing the elements of the line contact and switch assembly;

Fig. 5 is an exploded view in perspective of the base of the desk stand and the apparatus mounted thereon; and

Fig. 6 is a plan view showing details of the assembly illustrated in Fig. 5.

Referring now to the drawings, the telephone desk set in one form of this invention comprises a hand telephone including a handle l0 having receiver H and the transmitter i 2 mounted thereon at opposite ends. The desk stand for 5 the hand telephone comprises a base plate l3, to be described in greater detail hereinafter, and a casing or housing including a base portion l4 and a pedestal portion i5 having substantially triangular side walls and sloping end walls upon 10 one of which a dialing mechanism l 6 is mounted. A plurality of pairs of tines I! and I 8 extend from the pedestal portion adjacent the apices of the side walls and define a cradle for accommodating the handle H] of the hand telephone.

The tines El and I8 may be formed integrally with the casing which may be cast as a unitary element of metal or molded of a suitable insulating material such as a phenolic condensation product.

A unitary switch assembly, which may be of the general construction disclosed in the copending application of Douglas H. King, Serial No. 638,666, filed October 20, 1932, comprises ametallic stamping or bracket l9, shown more clearly in 5 Fig. 4, which is disposed within the pedestal portion 1 5 of the casing and is secured to the top Wall of 'the casing by screws 2E] which are threaded into the casing. The stamping or bracket I9 is provided with: a downwardly ex- 30 tending flange 2! upon which an electrical filter 22 including a condenser and an inductance (not shown) is mounted. The filter 22 is connected across the terminals of the dialing mechanism It to prevent interference with nearby radio re- 35 ceiving apparatus when the dialing mechanism I6 is operated. The stamping or bracket I9 is also provided with a downwardly extending arm 23 upon which a contact assembly 24 is mounted.

A pair of parallel arms 25 extend from the 40 stamping l9 and are provided with apertures 26 for receiving a rod or shaft 21. A metallic rocker or bridge member 28 is rockably mounted upon the rod or shaft 2'! and is formed with parallel extensions 29 which are disposed one ad- 45 jacent each of the arms 25 and are provided with apertures 38 to receive the rod or shaft 21. One of the extensions 29 is formed with an arm 3| which extends parallel to the shaft 21 and is provided with a projecting stud 32 adapted to 50 engage one of the spring fingers of the contact assembly 24. Parallel plungers or cylindrical rods 33 extend slidably through tubular metallic inserts 34 in the top of the pedestal l5 and project one between each of the pairs of tines I1 and I8. Each of the extensions 29 is pivotally connected at one end to a plunger or rod 33 by a cotter pin 35. The plungers or rods 33 reciprocate in accordance with the association or disassociation of the hand telephone with the cradle of the desk stand and thereby rock the bracket member 28 to actuate the contact assembly 24.

This construction prevents accidental operation of'the contacts 24 by tilting of the hand telephone in the cradle and also insures quick action of the contacts 2% when the hand telephone is placed upon the cradle.

The base plate l3 which may be of metal comprises a rectangular frame 36 over which a sheet 31 of felt or similar material is clamped by a band 38 fitted in the frame. An auxiliary base or mounting plate 39 has mountedthereon the usual substation apparatus such as a condenser 4E5, induction coil ii and ringer t2. Ihe condenser 40 is clamped against flanges $3 on the plate 39 by a spring clip The inductioncoil 4| may be secured to the plate 39 by screws 35. The ringer 42 is disposed with its magnet 56 pcsitioned between tabs ll extending from the plate 39, and is locked in posi'ion by a multiarm spring member or clip is integral with the tabs 4! and engaging the magnet and another spring or looking member which is secured to a raised portion 49 on the plate 39 by a single screw 50 and is provided with a plurality of fingers 5| which engage the gong supports 52 of the ringer. The spring or looking member is also provided with curved extensions 53, the ends of which engage corrugations 5G in the plate 33 and prevent rotation of the spring member about the bolt '50 The auxiliary base or mounting plate 39 is provided with a projecting tongue 55 which is adapted to fit in a groove or slot formed by a raised portion 56 on the frame 36. A single screw 51 extends through an aperture 58 in the raised portion 49 of the mounting plate 35 and is threaded intoan extension 59 on the frame 36 to lock the mounting plate within the frame.

7 It will be readily apparent that the aforedescribed construction greatly expedites the assembly, manufacture and repair of telephone desk stands. The various elements of substation apparatus may be easily mounted on the auxiliary base or mounting plate 39 and the complete apparatus assembly may be easily mounted as a unit on the frame 36 and secured thereto by a single screw such as 51. The entire base assembly is hinged to the casing by a flexible strip of leather or woven fabric 69 as shown in Fig. 3 and may be secured to the casing by screws 6| as shown more clearly in Fig. 2.

What is claimed is:

1. A telephone mounting comprising a casing, a base for said casing having a slot in one end thereof, a mounting plate, substation apparatus including a condenser, an inductance coil and a ringer supported on said mounting plate, said plate having aprojection at one end disposed in said slot, and a single screw securing said mounting plate to said base.

2. A desk stand for a hand telephone com- I prising a casing having a cradle thereon for re ceiving the handle of said hand telephone, coni said hand telephone with said cradle, a base plate hinged to said casing having a slot in one wall thereof, a mounting plate having a plurality of tabs extending therefrom, a condenser on said mounting plate positioned against certain of said tabs, a spring clip secured to said mounting plate and holding said condenser against said certain tabs, a ringer assembly including a magnet positioned between and in engagement with other of said tabs, a spring clip secured to said mounting plate and holding said magnet on said mounting plate, a locking member secured on said plate member and engaging said ringer assembly, said mounting plate having a tongue extending into said groove, and a single screw securing said mounting plate to said base plate. r

V 3. A telephone mounting comprising a base having a groove at one end thereof, an auxiliary base on said base having a tongue fitting in said groove, a condenser and a ringer on said auxiliary base, and means including spring clips detachably securing said condenser and said ringer on said auxiliary base.

GEORGE R. LUM 

